There's really only one rule to make Star Wars great again, and they seem to be following it already --
Don't let George Lucas write or direct. He gets too wrapped up in his own "brilliance", and surrounded by yes-men, so that every idiot idea he has gets pooped directly onto the script. And then he tells the actors to be more wooden. "Faster and more intense" is not direction, George, it's cartoons.
It's not a coincidence that the SW film that is thought of most highly by both fans and critics is The Empire Strikes Back, written by Leigh Brackett and Lawrence Kasdan, and directed by Irv Kershner, from a story idea by George.
For Trek, the one rule is that Berman and Braga are not allowed on the same studio lot as anyone actually involved in the creation or production of the show. On the other hand, if Ira Behr and and Ron Moore aren't too busy...
"Science teaches us to expect -- demand -- more than just eerie mysteries. What use is a puzzle that can't be solved? Patience is fine, but I'm not going to stop asking the universe to make sense!" - David Brin, "Those Eyes"
I'd add a 5th rule: romances should not seem wooden. Leading men should not either.
Completely Lucas' fault. The reason the scene where Anakin and Padme are having dinner is more natural (the scene with the "aggressive negotiations" line) is because Portman and Christiansen improvised the whole thing without any meddling from the big G.
Hayden Christiansen is a surprisingly decent actor if you actually let him act.